In a reflector antenna[?], the relative reduction in the effective aperture of the antenna caused by the masking effect of other antenna parts, such as a feed horn or a secondary reflector, which parts obstruct the radiation path.
... The racial makeup of the town is 95.82% White, 0.50% African American, 0.04% Native American, 1.49% Asian, 0.00% Pacific Islander, 1.08% from other races, and ...